A properly installed drainage system directing water away from the property.

The Secret to Perfect Drainage: Gravel, Ag Pipe & a Sock (Yes, a Sock!)

February 10, 20253 min read

Video Link: https://www.instagram.com/reel/DCcX60FItn7/?utm_source=ig_web_copy_link&igsh=MzRlODBiNWFlZA==

The Secret to Perfect Drainage: Gravel, Ag Pipe & a Sock (Yes, a Sock!)

When it comes to backyard drainage, the last thing anyone wants is a mini lake forming every time it rains. That’s why I swear by a simple but effective combination: drainage gravel, an ag pipe, and—wait for it—a sock. Not the one you lost in the wash, but a specially designed cloth sock that works wonders for keeping your drainage system clog-free. Let’s break it down.

Step 1: Laying the Foundation with Drainage Gravel

A bed of drainage gravel ready for ag pipe installation.

The first thing I do is lay down a bed of drainage gravel. Why? Because gravel allows water to flow freely while preventing soil from clogging up the system. I aim for a height of about 200mm off the ground—just enough to give the ag pipe a solid base to sit on without getting buried in mud.

Why Drainage Gravel Matters

  • It prevents water from pooling in unwanted areas.

  • It keeps the ag pipe from getting clogged.

  • It improves soil stability, especially around retaining walls and fences.

Step 2: The Mighty Ag Pipe (and Why It Needs a Sock)

A perforated ag pipe wrapped in a cloth sock to prevent root intrusion.

Next comes the real hero of the operation—the ag pipe. This perforated pipe is the secret weapon against waterlogging. Water seeps into the pipe, travels along its length, and is directed to a designated drainage point—like a stormwater pipe or the front of your property.

But here’s the twist: I always use an ag pipe with a cloth sock around it. Why? Because tree roots are sneaky little devils. They’ll chase after water like a dog after a tennis ball, and before you know it, your pipe is clogged with roots. The sock acts as a barrier, keeping roots out while still allowing water to enter the pipe.

Benefits of Using a Sock on Ag Pipe

  • Prevents tree roots from invading and blocking the pipe.

  • Reduces sediment buildup inside the pipe.

  • Extends the lifespan of your drainage system.

Step 3: Directing the Water Where You Want It

A properly installed drainage system directing water away from the property.

Once the ag pipe is in place, I make sure it leads to a stormwater drain or another strategic exit point. The last thing I want is for all that carefully redirected water to end up back where it started.

Smart Water Management Tips

  • Always slope the pipe slightly downward to encourage water flow.

  • Direct water away from the foundation of your home to prevent damage.

  • Use gravel and sand layers to enhance filtration and prevent clogging.

Step 4: The Grand Finale—A Colorbond Fence

Now that the drainage system is sorted, it’s time for the finishing touch—a Colorbond fence. Not only does it look sleek and modern, but it’s also incredibly durable. With proper drainage in place, I don’t have to worry about water pooling at the base of the fence and causing erosion.

Why Colorbond?

  • Resistant to rust, termites, and fire.

  • Available in a range of colours to suit any backyard.

  • Low maintenance and long-lasting.

Conclusion: A Simple Yet Effective Drainage Solution

By using a combination of drainage gravel, ag pipe, and a cloth sock, I can create a drainage system that keeps water moving, prevents root invasion, and maintains the integrity of the landscape. And with a Colorbond fence on top, it’s a win-win for both functionality and aesthetics.

So next time you're planning a drainage project, remember: gravel, ag pipe, and a sock. Your backyard (and your sanity) will thank you!


Matty Mannion

Matty Mannion is the founder of Sunny Days Developments, a family-owned business specializing in high-quality home renovations on the Gold Coast. With a passion for transforming homes and a commitment to transparency, Matty shares valuable insights and practical tips to help homeowners and fellow renovators alike. Follow his journey as he brings homes to life, one project at a time.

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